Solving Performance Problems on Oracle DB
Matthew Vegh - Embarcadero
Thursday, June 26, 2014 - 11am
DBAs and database developers regularly spend a lot of time tracking down and resolving performance issues on the database servers they are responsible for; it can be very difficult, frustrating, and expensive. Given the complex interactions of applications, users and databases, new performance issues can arise almost as fast as old ones can be addressed. This session will simulate common performance problems on an Oracle server and then both identify those problems and provide effective solutions.
Matthew Vegh is a Software Architect at Embarcadero Technologies for the Embarcadero DB Power Studio family of products and has been with the company for the better part of a decade. He has over 15 years of development experience with a wide range of technologies and a definite preference for database tooling.

As illustrated in the video, Oracle Database is a program designed to hold lots of information, or data. There are all kinds of different databases and they all have their uses. Some of the most common ones are MySQL, SQL Server, Sybase, and MongoDB. All of these have different uses. The differences will be easier to understand after you learn more about each kind of database. We did not discuss it much in the video, but if you are wondering what “SQL” means in the title, it stands for structured query language. Structured query language is a human readable computer language that is used to tell databases to do things. We will discuss SQL and Oracle SQL Developer more in future videos.
Databases are better than spreadsheets because they allow multiple users at one time, different levels of access given to users, recovery options and transactions, and it is more protected from hacking and malicious destruction. Programming languages often have very useful functions or methods that can be used to communicate to a database and therefore they are a naturally good option for the back end of programs.
This course will go over all of the major parts of database programming using Oracle SQL. We will be using Oracle 11g, but these videos should still work with other versions, including the most recent 12c.
Q and A
~~~~~~
How much does Oracle cost? The full enterprise edition costs thousands. They have other versions for less and they even have a FREE VERSION! This is known as the XE version (eXpress Edition). That is the one we will be using.
How long does it take to learn SQL? You can learn all of the basics and be an efficient beginner database developer in only about a month of practice. To become an intermediate it can take anywhere from an additional 3 - 6 months with a only a few hours of studying and practicing each day.
How can I learn SQL faster? Take notes and actually mess around with making your own database. Watch these videos until you understand the concepts within them, read articles and books that teach in more depth.
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Oracle tutorial: Explain plan for query optimization in Oracle PLSQL
oracle tutorial for beginners
using execution plan to optimize query
sql query analyzer
sql query cost analysis
https://techquerypond.wordpress.com
This oracle tutorial show you how to use EXPLAIN PLAN in oracle.
This video covers how to check cost of the query from DBMS_XPLAN.DISPLAY .
You can find the cost of the query using the Using EXPLAIN PLAN FOR and based on the result you can optimize the query for faster performance.
Subscribe on youtube:
https://www.youtube.com/channel/UCpiyAesWNYOXSz5GPq8lbkA
For more tutorial please visit #techquerypond
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What Programming Language Should Programmers Learn In 2019? 💻
👉🏻https://www.youtube.com/watch?v=CwaSHqAWPUU
What Programming Language Should Programmers Learn In 2019? 💻
👉🏻https://www.youtube.com/watch?v=CwaSHqAWPUU
► SQL Developer: How To Become A Successful SQL Developer? ◄
" Oracle SQL Developer is the Oracle Database IDE. A free graphical user interface, Oracle SQL Developer allows database users and administrators to do their database tasks in fewer clicks and keystrokes. A productivity tool, SQL Developer's main objective is to help the end user save time and maximize the return on investment in the Oracle Database technology stack."
(Source: http://www.oracle.com/technetwork/developer-tools/sql-developer/what-is-sqldev-093866.html)
Becoming a SQL developer is not something we see very often. There is not so much talk about SQL developers on the internet, so, people who want to become one might get lost.
How do you become a SQL Developer?
Watch this video and find out!
Learn Cobol Programming? (2018 & Beyond): https://www.youtube.com/watch?v=f3WVa2zyyGE
Should You Focus On Getting Certifications?: https://www.youtube.com/watch?v=-LAzOBhIfPE
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"But I can’t change the queries that run in my database,” you say.
Not a problem! This webinar we explore the underutilized art of rewriting a SQL query in order to make it run faster. I'll show you how to make your SQL query performance skyrocket simply by changing the SQL text. But even if you truly can't change the SQL, I'll also demonstrate how you can hurdle this issue too.
This webinar will be presented by our most active OraPub SLACK member, Kaley Crum!
To watch the full webinar go to www.oraoub.com/webinars

Hello friends in this video we learn how the lock occur in database automatically when multiple user modified the same transaction in their session. #RowLevelLock Oracle database Unbeatable,Unbreakable Platform..

Hello Everyone,
In this tutorial,
Step by Step Process
http://www.cloudnetwork.in/2015/02/how-to-install-configure-oracle.html
Let us Install Oracle Database 12c R1 Enterprise Edition on Ubuntu 14.10 – 64Bit
Completely Install & Configure of Oracle Database 12c Enterprise Edition on Debian/Linuxmint 7,17 and Ubuntu 14.10 LTS Desktop
Note :- Completed Installation time take around 1hr or 2hr above. Depends upon Hardware configuration of your System.
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60 minute overview of the product including a demo.
Bookmarks, as this is a LONG Video:
09:32 - Release History
12:38 - Feature List/Summary
17:25 - End of PPT Show, Live Demo The Worksheet
42:27 - Exploring your Schema with the GUI
48:15 - Working with PL/SQL
54:22 - Using the Debugger
59:30 - Reports
1:02:30 - How to find objects

https://dbagenesis.com/p/oracle-advanced-rman-backup-recovery
RMAN has the ability to duplicate, or clone, a database from a backup or from an active database. It is possible to create a duplicate database on a remote server with the same file structure, a remote server will a different file structure or the local server with a different file structure.
Cloning the database on the remote host requires two servers. Both servers should have Oracle Software installed on them.

Larry Ellison didn't wait long after coming onto the Oracle OpenWorld conference stage in San Francisco on Sunday before announcing a new set of cybersecurity-oriented products.
In his first keynote of Oracle's annual use conference, the executive chairman announced a new autonomous database that can patch itself from cybersecurity flaws without having to go offline.
Source: http://www.businessinsider.com/oracle-18c-database-patch-cybersecurity-flaws-2017-10

In this webinar Oracle Ace, Craig Shallahamer, will demonstrate how to do an Oracle time based analysis including integrating the OS situation into our analysis and finding the true “top” SQL.
This journey includes a trip into Oracle’s library cache, memory access control and some interesting ways to improve SQL statement performance.
Overall performance sucks as far as the users are concerned. After months of meetings management finally wants you to get involved. You run an AWR report for one of the most intense hours and notice the top “event” is "DB CPU" followed by "cursor: pin S wait on X”. This is where the webinar begins!

This video shows how to use SnapCenter to create a flexible backup policy, perform backup of an oracle database running in NetApp storage, and replicate backups to the cloud for long term retention.
Want to learn more? Visit the SnapCenter Resources page: https://mysupport.netapp.com/snapcenter/resources

This video explains analytical functions and how they are implemented in real projects.
Analytical functions are somewhat similar to aggregate functions,but they offer much more.
Why use analytical function ? They allow you to write fast and concise queries which otherwise will involve self join and long processing times
They allow you to perform aggregate functions independently on sets of partitions. You can access values from previous rows in current row and you can restrict the window on which you want to apply this analytical function.
I have given additional practice exercises along with the dataset so that you can comfortably work with analytical functions.
You can find the sample problems along with dataset in the below link.
http://www.internshipsfromhome.com/oracle-analytical-functions-ddl-and-dml/

This tutorial is all about Sequence In Oracle Database. In this SQL Tutorial you will learn How to create a sequence How to populate a Primary key column (auto increment in Oracle) using Sequence How to drop a sequence
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How to create Virtual Columns in Oracle Database 12c
When queried, virtual columns appear to be normal table columns, but their values are derived rather than being stored on disc. The syntax for defining a virtual column is listed below.
column_name [datatype] [GENERATED ALWAYS] AS (expression) [VIRTUAL]
If the datatype is omitted, it is determined based on the result of the expression. The GENERATED ALWAYS and VIRTUAL keywords are provided for clarity only.
The script below creates and populates an employees table with two levels of commission. It includes two virtual columns to display the commission-based salary. The first uses the most abbreviated syntax while the second uses the most verbose form.
CREATE TABLE employees (
id NUMBER,
first_name VARCHAR2(10),
last_name VARCHAR2(10),
salary NUMBER(9,2),
comm1 NUMBER(3),
comm2 NUMBER(3),
salary1 AS (ROUND(salary*(1+comm1/100),2)),
salary2 NUMBER GENERATED ALWAYS AS (ROUND(salary*(1+comm2/100),2)) VIRTUAL,
CONSTRAINT employees_pk PRIMARY KEY (id)
);
INSERT INTO employees (id, first_name, last_name, salary, comm1, comm2)
VALUES (1, 'JOHN', 'DOE', 100, 5, 10);
INSERT INTO employees (id, first_name, last_name, salary, comm1, comm2)
VALUES (2, 'JAYNE', 'DOE', 200, 10, 20);
COMMIT;
Querying the table shows the inserted data plus the derived commission-based salaries.
SELECT * FROM employees;
ID FIRST_NAME LAST_NAME SALARY COMM1 COMM2 SALARY1 SALARY2
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
1 JOHN DOE 100 5 10 105 110
2 JAYNE DOE 200 10 20 220 240
2 rows selected.
SQL
The expression used to generate the virtual column is listed in the DATA_DEFAULT column of the [DBA|ALL|USER]_TAB_COLUMNS views.
COLUMN data_default FORMAT A50
SELECT column_name, data_default
FROM user_tab_columns
WHERE table_name = 'EMPLOYEES';
COLUMN_NAME DATA_DEFAULT
------------------------------ --------------------------------------------------
ID
FIRST_NAME
LAST_NAME
SALARY
COMM1
COMM2
SALARY1 ROUND("SALARY"*(1+"COMM1"/100),2)
SALARY2 ROUND("SALARY"*(1+"COMM2"/100),2)
8 rows selected.
SQL
Notes and restrictions on virtual columns include:
1)Indexes defined against virtual columns are equivalent to function-based indexes.
2)Virtual columns can be referenced in the WHERE clause of updates and deletes, but they cannot be manipulated by DML.
3)Tables containing virtual columns can still be eligible for result caching.
4)Functions in expressions must be deterministic at the time of table creation, but can subsequently be recompiled and made non-deterministic without invalidating the virtual column. In such cases the following steps must be taken after the function is recompiled:
a)Constraint on the virtual column must be disabled and re-enabled.
b)Indexes on the virtual column must be rebuilt.
c)Materialized views that access the virtual column must be fully refreshed.
d)The result cache must be flushed if cached queries have accessed the virtual column.
e)Table statistics must be regathered.
5)Virtual columns are not supported for index-organized, external, object, cluster, or temporary tables.
6)The expression used in the virtual column definition has the following restrictions:
a.It cannot refer to another virtual column by name.
b.It can only refer to columns defined in the same table.
c.If it refers to a deterministic user-defined function, it cannot be used as a partitioning key column.
e.The output of the expression must be a scalar value. It cannot return an Oracle supplied datatype, a user-defined type, or LOB or LONG RAW.

1.Shrink the Table:
Shrinking is started from 10g. In this method I’m using user u1 and table name sm1.
Now I’m deleting some rows in sm1
COUNT
----------
1048576
Table sm1 has 1048576 rows.
[email protected]: delete from sm1 where deptno=10;
262144 rows deleted.
I deleted above number of rows.
Rows COUNT
----------
786432
And I’m giving commit
[email protected]: commit;
Commit complete.
So now we have 786432 rows in sm1 table. Now see the following command
[email protected]: select OWNER,TABLESPACE_NAME,SEGMENT_NAME,SEGMENT_TYPE,BYTES/1024/1024||' mb'"space",BLOCKS,EXTENTS from dba_segments where tablespace_name like 'U%TS';
OWNER TABLESPACE_NAME SEGMENT_NAME SEGMENT_TYPE space BLOCKS EXTENTS
----- --------------- ------------- ------------- ------ ---------- ----------
U1 U1TS SM1 TABLE 29 mb 3712 44
After I deleted some rows in sm1 table still above result showing same values, so now our duty is shrink this table.
This is done by following 2 ways,
i By using COMPACT key word:
In this method shrinking is done in two phases. In the first phase all fragmented space are just defragmented, but still the High Water Mark is persist with last used block only. That mean used free blocks are not de allocated and HWM is not updated here. Issue the following command before use shrink command.
[email protected] alter table sm1 enable row movement;
Table altered.
There is particular use with above command, when we shrink the table all rows are moves to contiguous blocks, so here row movement should be done. By default the row movement is disabled for any table, so above command enabled the row movement. Then execute shrink command now.
[email protected]: alter table sm1 shrink space compact;
Table altered.
Now see the space of table by using below command.
[email protected]: select OWNER,TABLESPACE_NAME,SEGMENT_NAME,SEGMENT_TYPE,BYTES/1024/1024||' mb'"space",BLOCKS,EXTENTS from dba_segments where tablespace_name like 'U%TS';
OWNER TABLESPACE_NAME SEGMENT_NAME SEGMENT_TYPE space BLOCKS EXTENTS
----- --------------- ------------- ------------- ------ ---------- ----------
U1 U1TS SM1 TABLE 29 mb 3712 44
So here seems nothing happened with above shrink command, but internally the fragmented space is defragmented. But the high water mark is not updated, used free blocks are also not de allocated.
For de allocating the used blocks we have to execute below command. This is the second phase.
[email protected]: alter table sm1 shrink space;
Table altered.
Now see the space by using below command.
[email protected]: select OWNER,TABLESPACE_NAME,SEGMENT_NAME,SEGMENT_TYPE,BYTES/1024/1024||' mb'"space",BLOCKS,EXTENTS from dba_segments where tablespace_name like 'U%TS';
OWNER TABLESPACE_NAME SEGMENT_NAME SEGMENT_TYPE space BLOCKS EXTENTS
----- --------------- ------------- ------------- ---------- ---------- ----------
U1 U1TS SM1 TABLE 20.8125 mb 2664 36
So now the space of sm1 table is reduced.
Note: Actually the alter table sm1 shrink space command will complete these two phases of the shrinking of table at a time. But here we done shrink process in two phases because when we use alter table sm1 shrink space command the table locked temporarily some time period, during this period users unable to access the table. So if we use alter table sm1 shrink space compact command the table is not locked but space is defragmented. When we not in business hours issue the second phase shrink command then users are won’t get any problem.
ii Because of above method the table dependent objects are goes to invalid state, to overcome this problem we have to use below command.
[email protected]: alter table sm1 shrink space cascade;
Table altered.
The above command also shrinks the space of all dependent objects. We also do this in two phases like above two phases. See the below command.
[email protected]: alter table sm1 shrink space compact cascade;
Table altered.
And then
[email protected]: alter table sm1 shrink space cascade;
Table altered.
Transporting tablespace to different platform by Using RMAN : https://www.youtube.com/watch?v=CN401PUKK4A
Oracle EBS apps Upgrade from 12 2 to 12 2 5 (start CD 51) : https://www.youtube.com/watch?v=zeO4goqR70Y
Transport tablespace by using RMAN.: https://www.youtube.com/watch?v=YG6kWX7Par8

RebellionRider.com present PL/SQL tutorial on Introduction to PL/SQL Packages in Oracle Database By Manish Sharma
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The combination of Oracle Solaris 11 and Oracle Database 12c introduces a new, unique, and powerful capability.
In this screencast, Jon Haslam describes how the Oracle Database and Oracle Solaris engineering teams worked together to integrate DTrace and V$ Views to provide a top-to-bottom picture of a database transaction I/O -- from storage devices, through the Oracle Solaris kernel, up to Oracle Database 12c itself.
With this end-to-end view, you can easily identify I/O outliers -- transactions that are taking an unusually long time to complete -- and use this comprehensive data to identify and mitigate storage system problems that were previously extremely hard to debug.

This tutorial demonstrates on how to get the results from the database using "SELECT" command based on the search criteria..U can download the source code from the link below
https://docs.google.com/folder/d/0B3Bcu4SdEpidRV8tcVY3Z1RUcXc/edit

This class is based on 2day DBA document available at oracle website. we further condences a 2day DBA coursce into 2hours class with effective infographics and exact need to know information.
Hard to belive, well let us demonstrate this with agenda of the class itself. In traditional way PPT slide will be read out to tell you the topics .
we enhance this with infographics like this rocket analogy for your best understanding and long time memory. Well oracle database administration is not complicated as rocket science if we can explain you in simple terms.
This 2hours class is ment to give you a good overview of adminstration subject.we will understand essential concepts in this overview.
From the concepts of database management system we will study how oracle desigened its rdbms in architecture class.
architecture details about instance and database ,we will give closer look at what kind of physical files consists in database. this is covered in physical storage structure topic.
The developers and users of database do not directly deal with this physical structure rather they use logical storage names we will understand how to manage these in "logical storage structure".
Developers are not only users of the database these are system users who create and manage the system ,there are developers who develop applications for regular user to use db.
How to manage the user and and there roles is described in user and roles topic.users carry database objects like table,views ,programing language objects like procedure and functions. all these collection of objects for a user is called schema ,schema management topic will give this in full details. the last topic covers the network connectivity from the oracle servers to user machines

In this video you will understand how an Oracle RAC cluster recovers from an Instance Crash which is also called Crash Recovery.
The video will use the whiteboard to show you what happens when one of the nodes crashes in a Cluster and how the surviving node recovers the failed node related transactions.
Our Upcoming Online Course Schedule is available in the url below
https://docs.google.com/spreadsheets/d/1qKpKf32Zn_SSvbeDblv2UCjvtHIS1ad2_VXHh2m08yY/edit#gid=0
Reach us at [email protected]

Have you ever wondered how the Oracle Database 12c (and earlier versions) determines the wait time when it has absolutely no control over how long the wait will take? If so, then read on in my blog posting: http://blog.orapub.com/20140630/How-The-Oracle-Database-Determines-Wait-Time-When-It's-Not-Set.html
Check out OraPub's Online Institute where this topic is part of the seminar, Introduction To Oracle Time Based Analysis. https://resources.orapub.com/OraPub_Online_Seminars_About_Oracle_Database_Performance_s/100.htm